Not medical advice — written by Ngoc Vietsmall, who is not a healthcare professional.
This article summarises publicly available medical information for general readers. It cannot account for your history, medication or symptoms, and it is not a diagnosis or a treatment plan. Any dose mentioned comes from published labelling or guidelines — only your own prescriber can decide what is right for you.
Always speak to a doctor or pharmacist before starting, stopping or changing any treatment. If symptoms are severe or getting worse, seek urgent care. Full disclaimer · How this is written
Ever wonder why your period sometimes feels like a surprise party you didnt plan for? In simple terms, abnormal uterine bleeding (AUB) is any menstrual flow thats irregular in timing, amount, or duration and isnt part of a normal cycle. The modern PALMCOEIN system splits AUB into nine distinct categoriesfour structural (Polyp, Adenomyosis, Leiomyoma, Malignancy/Hyperplasia) and five nonstructural (Coagulopathy, Ovulatory dysfunction, Endometrial, Iatrogenic, Not otherwise classified). Knowing which bucket you fall into is the first step toward the right treatment.
Quick Answer Intro
Answer 1: Abnormal uterine bleeding is any deviation from a regular menstrual patternheavy flow, spotting between periods, or bleeding that lasts longer than a week.
Answer 2: The PALMCOEIN classification helps doctors zero in on the cause, whether its a fibroid, a hormone issue, or something else entirely, so you can get an evidencebased abnormal uterine bleeding treatment plan.
What Is AUB
Definition and How Doctors Spot It
AUB covers any bleeding that strays from your usual monthly rhythm. Typical red flags include:
- Heavy flow that soaks through a pad or tampon every hour.
- Spotting or bleeding between regular periods.
- Periods that last more than 8days.
- Sudden changes in the pattern after previously regular cycles.
If you tick any of these boxes, a quick selfcheck (just jot down the days you bleed and how many pads you use) can give your clinician a solid starting point.
Why the PALMCOEIN System Matters
Think of PALMCOEIN as the period detective framework. Each letter stands for a potential source of bleeding, guiding both the workup and the treatment plan.
| Letter | Category | Typical Examples |
|---|---|---|
| P | Polyp | Endometrial polyp, cervical polyp |
| A | Adenomyosis | Uterine tissue growing into the muscle wall |
| L | Leiomyoma | Fibroids (submucosal, intramural, subserosal) |
| M | Malignancy/Hyperplasia | Endometrial cancer, atypical hyperplasia |
| C | Coagulopathy | Von Willebrand disease, platelet disorders |
| O | Ovulatory Dysfunction | PCOS, thyroid imbalance, extreme weight loss |
| E | Endometrial | Primary endometrial disorder, hormonal imbalance |
| I | Iatrogenic | Hormonal IUD, anticoagulants, NSAIDs |
| N | Not Otherwise Classified | Rare mixedcause cases |
The 9 Types
PolypRelated AUB
Endometrial polyps are small, benign growths that line the uterus. Theyre often painless but can cause sudden, heavy bleeding. A simple hysteroscopic polypectomy usually settles the issue.
Key Points at a Glance
- Common in women 4050years old.
- Diagnosed via hysteroscopy or saline infusion sonography.
- Usually treated with removal; recurrence is low.
RealWorld Example
Sarah, a 45yearold teacher, started spotting after menopause. An ultrasound showed a 2cm polyp; a quick hysteroscopic removal stopped the bleeding within weeks.
AdenomyosisRelated AUB
Adenomyosis occurs when endometrial tissue grows into the uterine muscle, making the wall thick and tender. It often leads to heavy, prolonged periods and a feeling of uterine heaviness.
Key Points at a Glance
- Typical age: 3550years.
- Ultrasound or MRI can reveal a thickened junctional zone.
- Treatment ranges from hormonal therapy to uterussparing surgery.
RealWorld Example
Maria, a 38yearold graphic designer, complained of bleeding for days and severe cramping. MRI confirmed adenomyosis; a levonorgestrelreleasing IUS (LNGIUS) trimmed her flow dramatically.
Leiomyoma (Fibroid)Related AUB
Fibroids are the most common structural cause of AUB. Submucosal fibroids, which bulge into the uterine cavity, are especially notorious for heavy bleeding.
Subtype Table
| Fibroid Type | Location | Bleeding Impact |
|---|---|---|
| Submucosal | Just under the lining | Severe, irregular bleeding |
| Intramural | Within muscular wall | Moderate bleeding, pressure symptoms |
| Subserosal | Outside the uterus | Usually minimal bleeding |
Management options include myomectomy, uterine artery embolization, or GnRHagonists for shortterm shrinkage.
Malignancy/HyperplasiaRelated AUB
When bleeding is new, heavy, and occurs after menopause, cancer creeps into the conversation. Endometrial hyperplasiaespecially atypicalcan precede cancer.
RedFlag Symptoms
- Postmenopausal bleeding.
- Bleeding after intercourse.
- Unexplained weight loss or pelvic pain.
A definitive endometrial biopsy is the gold standard. Early detection dramatically improves outcomes.
CoagulopathyRelated AUB
Bleeding disorders, like von Willebrand disease, make blood clot slower than usual, translating into heavier menstrual flow.
Lab Tests to Request
- Complete blood count (CBC) checks anemia.
- PT/INR and aPTT basic clotting screens.
- Von Willebrand factor assay if suspicion is high.
Treatment may involve iron supplementation, clotting factor concentrates, or antifibrinolytics such as tranexamic acid.
OvulatoryDysfunction AUB
When the ovary fails to release a mature egg, estrogen builds up without progesterone to balance itresulting in irregular or absent periods and breakthrough bleeding.
Common Triggers
- Polycystic ovary syndrome (PCOS).
- Thyroid disorders (both hypo and hyper).
- Extreme weight changeseither loss or gain.
Combined oral contraceptives (COCs) or progestinonly pills often restore regular cycles.
EndometrialRelated AUB
This category captures primary disorders of the uterine lining, such as endometrial instability where the lining overgrows and sheds unpredictably.
Diagnostic Clue
Transvaginal ultrasound showing an endometrial thickness >12mm in a reproductiveage woman may hint at this cause.
Iatrogenic AUB
Medications and devices can unintentionally mess with your cycle. Hormonal IUDs, anticoagulants (like warfarin), and even regular NSAIDs can cause spotting or heavier bleeding.
Management Tips
- Review all current meds with your provider.
- Switch to a different contraceptive method if needed.
- Adjust anticoagulant dosage under medical supervision.
Not Otherwise Classified (NOC) AUB
Sometimes the cause is a mix of several factors or something rare that doesnt fit neatly into the PALMCOEIN chart. When that happens, a multidisciplinary approachoften involving a hematologist, endocrinologist, and gynecologic surgeonis the safest route.
How To Diagnose
FirstLine Evaluation (History & Physical)
Ask yourself (or your doctor): When did the change start? How many pads or tampons per day? Any pain, weight loss, or new meds? A thorough history often narrows the list dramatically.
Imaging and Laboratory Tools
- Transvaginal ultrasound: Firstline for structural lesions.
- MRI: Best for adenomyosis and deep infiltrating fibroids.
- Endometrial biopsy: Crucial for any postmenopausal bleeding.
- Blood work: CBC, iron studies, thyroid panel, coagulation profile.
Using the PALMCOEIN Algorithm
Start with structural possibilities (PALM). If imaging is negative, move to nonstructural (COEIN). A flowchart graphic (you could create one for a presentationthink abnormal uterine bleeding ppt) helps keep the process clear.
Sample Diagnostic Checklist (Downloadable PDF)
You can copy this checklist into a notetaking app to stay organized during appointments.
Treatment Options
Structural Causes
- Polyps: Hysteroscopic removalquick, outpatient, and often curative.
- Adenomyosis: Hormonal therapy (e.g., LNGIUS) first; for refractory cases, uterinesparing surgery or, rarely, hysterectomy.
- Fibroids: Myomectomy for fertilitypreserving patients; uterine artery embolization for symptomatic relief; GnRHagonists for shortterm shrinkage before surgery.
- Malignancy/Hyperplasia: Endometrial sampling, followed by hysterectomy or hormonal management depending on stage.
NonStructural Causes
- Coagulopathy: Iron supplements, tranexamic acid, or specific clotting factor therapy.
- Ovulatory Dysfunction: COCs, progestinonly pills, or lifestyle changes (weight management, stress reduction).
- Endometrial: Progestinonly therapy or LNGIUS to stabilize the lining.
- Iatrogenic: Review and adjust medications; consider switching contraceptive methods.
When Surgery Is Needed
Hysterectomy remains the definitive solution for severe, refractory AUB, but its a big decision. Alternatives like endometrial ablation can be effective for women who have completed childbearing.
Medication Cheat Sheet
Common drugs to stop uterine bleeding include:
- Tranexamic acid (TXA)
- Levonorgestrelcontaining IUS
- Combined oral contraceptives
- Progestinonly pills (e.g., norethindrone)
Guideline Corner
ACOG & RCOG Recommendations
Both the American College of Obstetricians and Gynecologists (ACOG guidelines) and the Royal College of Obstetricians and Gynaecologists (RCOG guidelines) emphasize a stepwise approach: start with a thorough history, use ultrasound as the first imaging modality, and apply the PALMCOEIN framework for classification.
How PALMCOEIN Aligns With Global Standards
The International Federation of Gynecology and Obstetrics (FIGO) officially adopted PALMCOEIN, making it the universal language for AUB across continents. This alignment means that the same terminology you hear in an abnormal uterine bleeding pdf from a UK site will match what your US doctor writes in her notes.
QuickReference Table: ACOG vs. RCOG vs. FIGO
| Organization | Primary Goal | Key Diagnostic Steps |
|---|---|---|
| ACOG | Standardize care in the US | History Ultrasound Biopsy if indicated |
| RCOG | Evidencebased UK practice | History TVUS Lab work (including coagulation) |
| FIGO | Global classification | PALMCOEIN algorithm Tailored treatment |
Lifestyle Tips
Even the best medical plan shines brighter when you give your body the support it craves.
Nutrition & Iron
Heavy bleeding can drain iron stores fast. Load up on leafy greens, lentils, and lean red meat. A daily cup of fortified cereal can be a simple iron boost.
Exercise & Stress Management
Moderate aerobic activity improves circulation and hormonal balance. Yoga or mindfulness apps can also lower stressinduced ovulatory dysfunction.
Tracking Your Cycle
Apps like Clue or Flo let you log flow volume, pain level, and any medication changes. Over a few months youll spot patterns that are pure gold for your doctors next visit.
Personal Anecdote
When I first started tracking, I realized my spotting episodes lined up exactly with the weeks I was taking ibuprofen for migraines. Cutting back on NSAIDs and switching to acetaminophen reduced those stray spots dramatically.
Bottom Line
Understanding the nine PALMCOEIN types of abnormal uterine bleeding turns a confusing, often scary symptom into a manageable health issue. Accurate classification guides the right abnormal uterine bleeding treatment, whether thats a quick polyp removal, a hormonereleasing IUS, or a multidisciplinary workup for rare coagulation problems. Remember, youre not alonedoctors, guidelines, and countless women have walked this path before you. Keep tracking, stay curious, and dont hesitate to bring any new symptom to your healthcare provider.
